1. Review: 10.2b Mini-Quiz
The revenue R (in dollars) from selling x units of an infant stroller is modeled by
𝑅=𝑥 35− 1 2 𝑥 , 0<𝑥<35.
Find the number of strollers that must be sold to produce a revenue of $

2. Class Greeting

3. Chapter 10 Quadratic Equations and Functions
Lesson 10-3a
Solving Quadratic Equations
by Using the Quadratic Formula

4. Objective: Students will learn how to solve quadratic equations using the quadratic formula.

5. Vocabulary
a formula that can always be used to solve quadratic equations.

6. 5x2 – x = 2 5x2 – x – 2 = 0 a = 5; b = –1; c = –2 𝑥= 1± 1−(−40) 10
Solve by using the Quadratic Formula.
5x2 – x = 2
5x2 – x – 2 = 0
a = 5; b = –1; c = –2
Quadratic Formula
𝑥= 1± 1−(−40) 10
𝑥= 1±
Answer:
Example 4-2e

8. Solve by using the Quadratic Formula.
and
Quadratic Formula
= 8±
𝑥= 4±
Answer:
Example 4-2a

9. Solve x2 – 2x – 35 = 0
Answer: The solution set is {–5, 7}.

10. Lesson Summary: Objective: Students will learn how to solve quadratic equations using the quadratic formula.

11. Preview of the next Lesson: Objective: Students will solve word problems by involving quadratic equations using the quadratic formula.

12. Do not round your answers.
Homework
/1,7,
Do not round your answers.
Leave your answers as square roots.

13. Stand Up Please